61620306 has 32 divisors (see below), whose sum is σ = 141523200. Its totient is φ = 17689680.

The previous prime is 61620269. The next prime is 61620341. The reversal of 61620306 is 60302616.

It is a super-2 number, since 2×61620306² = 7594124223067272, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23316 + ... + 25823.

It is an arithmetic number, because the mean of its divisors is an integer number (4422600).

Almost surely, 2^61620306 is an apocalyptic number.

61620306 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

61620306 is an abundant number, since it is smaller than the sum of its proper divisors (79902894).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61620306 is a wasteful number, since it uses less digits than its factorization.

61620306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49174.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 61620306 is about 7849.8602535332. The cubic root of 61620306 is about 394.9795556368.

The spelling of 61620306 in words is "sixty-one million, six hundred twenty thousand, three hundred six".